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Wewaii [24]
3 years ago
12

How much work is required to lift a 10-newton weight from 4.0 meters to 40 meters above the surface of Earth?

Physics
1 answer:
kumpel [21]3 years ago
6 0
<h3>Answer : 360J</h3>

<h3>Way to do : </h3>

s = 40m - 4m = 36m

W = F × s

= 10N × 36m = 360J

<h3>A bit of explanation : </h3>

W = Work (J)

F = Force / weight (N)

s = distance (m)

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<h3>What is the crust?</h3>

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3 0
2 years ago
A student throws a set of keys vertically upward to her sorority sister, who is in a window 3.50 m above. The second student cat
Mkey [24]

Answer:

a) 8.58 m/s upward

b) -2.211 m/s downward

Explanation:

Let gravitational acceleration g = -9.81m/s2. This is negative because it deceleration the upward motion of the key.

(a)We have the following equation of motion

s = v_0t + gt^2/2

where v_0 is the initial upward velocity of the keys, t = 1.1s is the time it takes for the keys to travel a distance of s = 3.5 m

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3.5 = 1.1v_0 - 5.94

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So the keys were thrown initially upward with a speed of 8.58 m/s

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v = v_0 + gt = 8.58 - 9.81*1.1 = -2.211 m/s

So they keys would have a downward speed of 2.211 m/s

5 0
3 years ago
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